Insulation monitoring relay CM-IWS

2CD

C 2

51 0

17 V

0012

Data sheet

Insulation monitoring relay CM-IWS.2For unearthed AC systems up to Un = 400 V AC

The CM-IWS.2 serves to monitor insulation

resistance in accordance with IEC 61557-8 in

unearthed IT AC systems with a voltage up to

400 V AC. The CM-IWS.2 can be configured to

the requirements of the applications and therefore

used multi-functional.

The device is available with two different terminal

versions. You can choose between the proven

screw connection technology (double-chamber

cage connection terminals) and the completely

tool-free Easy Connect Technology (push-in

terminals).

Characteristics – For monitoring the insulation resistance of unearthed IT

systems up to Un = 400 V AC – According to IEC/EN 61557-8 “Electrical safety in low

voltage distribution systems up to 1000 V a.c. and 1500 V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 8: Insulation monitoring devices for IT systems"

– Rated control supply voltage 24-240 V AC/DC – Measuring principle with superimposed DC voltage – One measuring range 1-100 kΩ – Precise adjustment of the threshold value in 1 kΩ steps – Fault storage / latching configurable by control input – Precise adjustment by front-face operating controls – Screw connection technology or

Easy Connect Technology available – Housing material for highest fire protection classification

UL 94 V-0 – Tool-free mounting on DIN rail as well as demounting – 1 c/o (SPDT) contact, closed-circuit principle – 22.5 mm (0.89 in) width – 3 LEDs for the indication of operational states

Approvals

A UL 508, CAN/CSA C22.2 No.14

C GL

K IEC/EN 60947-5-1, CB scheme

E GB14048.5 - 2001, CCC

D GOST

L RMRS

Marks

a CE

b C-Tick

2 - Insulation monitoring relay CM-IWS.2 | Data sheet

Order data

Insulation monitoring relay

Type Nominal voltage Un of the distribution system to be monitored

Rated control supply voltage Connection technology Order code

CM-IWS.2P 0-400 V AC 24-240 V AC/DC Push-in terminals 1SVR 740 670 R0200

CM-IWS.2S Screw type terminals 1SVR 730 670 R0200

Accessories

Type Description Order code

ADP.01 Adapter for screw mounting 1SVR 430 029 R0100

MAR.01 Marker label for devices without DIP switches 1SVR 366 017 R0100

COV.11 Sealable transparent cover 1SVR 730 005 R0100

Data sheet | Insulation monitoring relay CM-IWS.2 - 3

Connection technology

Maintenance free Easy Connect Technology with push-in terminals

Type designation CM-xxS.yyP

Approved screw connection technology with double-chamber cage connection terminals

Type designation CM-xxS.yyS

Push-in terminals

– Tool-free connection of rigid and flexible wires with wire end ferrule according to DIN 46228-1-A, DIN 46228-4-E Wire size: 2 x 0.5-1.5 mm², (2 x 20 - 16 AWG)

– Easy connection of flexible wires without wire end ferrule by opening the terminals

– No retightening necessary – One operation lever for opening both connection

terminals – For triggering the lever and disconnecting of wires

you can use the same tool (Screwdriver according to DIN ISO 2380-1 Form A 0.8 x 4 mm (0.0315 x 0.157 in), DIN ISO 8764-1 PZ1 ø 4.5 mm (0.177 in))

– Constant spring force on terminal point independent of the applied wire type, wire size or ambient conditions (e. g. vibrations or temperature changes)

– Opening for testing the electrical contacting – Gas-tight

Double-chamber cage connection terminals

– Terminal spaces for different wire sizes: fine-strand with/without wire end ferrule: 1 x 0.5-2.5 mm² (2 x 20 - 14 AWG), 2 x 0.5-1.5 mm² (2 x 20 - 16 AWG) rigid: 1 x 0.5-4 mm² (1 x 20 - 12 AWG), 2 x 0.5-2.5 mm² (2 x 20 - 14 AWG)

– One screw for opening and closing of both cages – Pozidrive screws for pan- or crosshead screwdrivers

according to DIN ISO 2380-1 Form A 0.8 x 4 mm (0.0315 x 0.157 in), DIN ISO 8764-1 PZ1 ø 4.5 mm (0.177 in)

Both the Easy Connect Technology with push-in terminals and screw connection technology with double-chamber cage connection terminals have the same connection geometry as well as terminal position.

2CD

C 2

53 0

25 F

0011

2CD

C 2

53 0

26 F

0011


Functions

Operating controls

2CD

C 2

51 0

17 V

0012

1 Test and reset button

2 Indication of operational states

U: green LED - control supply voltage

F: red LED - fault message

R: yellow LED - relay status

3 Configuration and setting

Front-face rotary switches for threshold value adjustment:

R.1 for R1 tens figures:

0, 10, 20, 30, 40, 50, 60, 70, 80, 90 kΩ in ten kΩ steps

R.2 for R1 units figures:

1, 2, 3, 4, 5, 6, 7, 8, 9, 10 kΩ in one kΩ steps

4 Marker label for devices without DIP switches

Application / monitoring function

The CM-IWS.2 serves to monitor insulation resistance in accordance with IEC 61557-8 in unearthed IT AC systems

The insulation resistance between system lines and system earth is measured. If this falls below the adjustable threshold values, the output relay de-energizes.

The device can monitor control circuits (single-phase) and main circuits (3-phase).

Supply systems with voltages Un = 0-400 V AC (45-65 Hz) can be directly connected to the measuring inputs and their insulation resistance being monitored. For systems with voltages above 400 V AC the insulation monitoring relay CM-IWN.x with or without the coupling unit CM-IVN can be used.

Measuring principle

A superimposed DC measuring signal is used for measurement. From the superimposed DC measuring voltage and its resultant current the value of the insulation resistance of the system to be monitored is calculated.

4

3

2

1


Operating mode

The system to be monitored is connected to terminal L. The earth potential is connected to terminal w.

The device operates according to the closed-circuit principle (fault state: relay de-energized).

Once the control supply voltage has been applied the insulation monitoring relay runs through a system test routine. The system is diagnosed and the settings are tested. If no internal or external faults are found after this test routine is completed, the output relay energizes.

If the measured value drops below the set threshold value, the output relay de-energizes. If the measured value exceeds the threshold value plus hysteresis, the output relay re-energizes.

All operating states are signalled by the front-face LEDs. See table "LEDs, status information and fault messages" on page 8.

Test function

The test function is only possible when there is no fault.

By pressing the front-face combined test/reset button a system test routine is executed. The output relay remains de-energized as long as the test/reset button is pressed, the control contact S1-S3 is closed or the test functions are processed.

The test function can be activated either with the front-face combined test/reset button or with a remote test button connected as shown in the picture.

S2 S3S1

2CD

C 2

52 1

09 F

0009

Fault storage, reset function and remote reset

The output relay remains de-energized and only energizes after the combined test/reset button is pressed or after the remote reset (terminals S2-S3) is activated, and when the insulation resistance is higher than the set threshold value plus hysteresis.

S2 S3S1

S2 S3S1

S2 S3S11.) Auto- Reset

1.) Front2.) Remote3.) A1-A2

1.) Front2.) A1-A2

2CD

C 2

52 1

11 F

0009


Function descriptions/diagrams

G Control supply voltage not applied / Output contact open / LED OFF

B Control supply voltage applied / Output contact closed / LED ON

A1-A2

S1-S3

S2-S3

11-1211-14

ts

2CD

C 2

52 0

07 F

0211

U: green LED

F: red LED

R: yellow LED

Measured value

HysteresisThreshold value

Closed-circuit principle

ts = Start-up time, fixed, max. 10 s

2CD

C 2

52 0

07 F

0211

Insulation resistance monitoring w/o fault storage, auto reset

A1-A2

S1-S3

S2-S3

11-1211-14

ts

2CD

C 2

52 0

05 F

0211

U: green LED

F: red LED

R: yellow LED

Measured value

HysteresisThreshold value

Closed-circuit principle

ts = Start-up time, fixed, max. 10 s

2CD

C 2

52 0

05 F

0211

Insulation resistance monitoring with fault storage, manual reset


Connection and wiring

Connection diagram

A1S1 S2 S3

11

wLA2

w

A1

R < wA2

L

14 12

12 14

11

2C

DC

252

102

F00

09

A1-A2

S1-S3

S2-S3

L

w

11-12/14

Control supply voltage

Remote test

Remote reset

Measuring circuit/input, system connection

Measuring circuit/input, earth connection

Output relay, closed-circuit principle

Wiring diagrams

L can be connected to any of the conductors.

Un ≤ 400 V AC

2CD

C 2

52 0

82 F

0009

L

N

PE

A1S1 S2 S3

11

wLA214 12

2CD

C 2

52 0

83 F

0009

2-wire AC system

2CD

C 2

52 0

89 F

0009

L1

L2

L3

PE

A1S1 S2 S3

11

wLA214 12

2CD

C 2

52 0

90 F

0009

3-wire AC system

2CD

C 2

52 0

96 F

0009 L1

L2

L3

N

PE

A1S1 S2 S3

11

wLA214 12

2CD

C 2

52 0

97 F

0009

4-wire AC system


Configuration and settings

Rotary switches R.1 and R.2 (treshold value)

By means of two separate 10 position rotary switches with direct reading scales, the threshold value for the insulation resistance RF of the systems to be monitored can be adjusted.

With the R.1 rotary switch the tens figure is set and with the R.2 rotary switch the units figure is set. The set threshold value is then the addition of the two values. For example, R1.1 set to 70 and R1.2 set to 8 leads to a threshold value for R1 of 78 kΩ.

Operating state indication

Indication of operational states

Operational state LED U (green) LED F (red) LED R (yellow)

Start-up W OFF OFF

No fault V OFF VInsulation fault

(below threshold value)V V OFF

Invalid measuring result V T OFF

Internal system fault OFF X OFF

Test function X OFF OFF

No fault after fault storage1)V

2)X

1) The device has triggered after an insulation fault. The fault has been stored and the insulation resistance has returned to a higher value than the threshold value plus hysteresis.

2) Depending on the fault.


Application examples

L1

N

PE

ConsumerThe power source in this case is the secondary side of an incomingtransformer which isolates the system for the application.

CM-IWS.2

A1S1 S2 S3

11

wLA214 12

2CD

C 2

52 0

11 F

0210

Earth fault / insulation resistance monitoring of an unearthed 2-wire IT AC system

L1

L2

L3

N

PE

M3~

The power source in this case is the secondary side of an incomingtransformer which isolates the system for the application.

A1S1 S2 S3

11

wLA214 12

CM-IWS.2

2CD

C 2

52 0

12 F

0210

Earth fault / insulation resistance monitoring of a 4-wire IT AC system


Technical data

Data at Ta = 25 °C and rated values, unless otherwise indicated

Input circuits

Input circuit - Supply circuit A1 - A2

Rated control supply voltage Us 24-240 V AC/DC

Rated control supply voltage tolerance -15...+10 %

Typical current / power consumption 24 V DC 30 mA / 0.7 VA

115 V AC 12 mA / 1.4 VA

230 V AC 12 mA / 2.8 VA

Rated frequency fs DC or 15-400 Hz

Frequency range AC 13.5-440 Hz

Power failure buffering time min. 20 ms

Start-up time ts, fixed max. 10 s

Input circuit - Measuring circuit L, wMonitoring function insulation resistance monitoring of IT systems

(IEC/EN 61557-8)

Measuring principle superimposed DC voltage

Nominal voltage Un of the distribution system to be monitored 0-400 V AC

Voltage range of the distribution system to be monitored 0-460 V AC (tolerance +15 %)

Rated frequency fN of the distribution system to be monitored 50-60 Hz

Tolerance of the rated frequency fN 45-65 Hz

System leakage capacitance Ce max. 10 µF

Extraneous DC voltage Ufg (when connected to an AC system) none

Number of possible response / threshold values 1

Adjustment range of the specified response value Ran

(threshold)

min.-max. 1-100 kΩ

Adjustment resolution 1 kΩ

Tolerance of the adjusted threshold value / Relative percentage

uncertainty A

at -5...+45 °C, Un = 0-115 %, Us = 85-110 %, fN, fs, Ce = 1µF

at 1-10 kΩ RF ±0.5 kΩ

at 10-100 kΩ RF ±6 %

Hysteresis related to the threshold value 25 %; min. 2 kΩ

Internal impedance Zi at 50 Hz 135 kΩ

Internal DC resistance Ri 185 kΩ

Measuring voltage Um 15 V

Tolerance of measuring voltage Um +10 %

Measuring current Im max. 0.1 mA

Response time tan 0.5 x Ran and Ce = 1 µF max. 10 s

Repeat accuracy (constant parameters) < 0.1 % of full scale

Accuracy of Ra (measured value) within the rated control supply

voltage tolerance

< 0.05 % of full scale

Accuracy of Ra (measured value) within the operation

temperature range

at 1-10 kΩ RF 5 Ω / K

at 10-100 kΩ RF 0.05 % / K

Transient overvoltage protection (w - terminal) Z-diode


Input circuit - Control circuits S1 - S2 - S3

Control inputs - volt free S1-S3 remote test

S2-S3 remote reset

Maximum switching current in the control circuit 1 mA

Maximum cable length to the control inputs 50 m - 100 pF/m (164 ft - 30.5 pF/ft)

Minimum control pulse length 150 ms

No-load voltage at the control input 24 V DC ± 5%

User interface

Indication of operational states

Control supply voltage U green LED

Fault message F red LED

Relay status R yellow LED

Details see table "LEDs, status information and fault messages" on page 8 and "Function descriptions/diagrams" on page 6.

Operating elements and controls

Adjustment of threshold value Ran R.1 rotary switch, 10 kΩ steps for the tens figure

R.2 rotary switch, 1 kΩ steps for the units figure

Output circuits

Kind of output relay, 1 c/o (SPDT) contact

Operating principle closed-circuit principle1)

Contact material AgNi alloy, Cd free

Rated operational voltage (IEC/EN 60947-1) 250 V AC / 300 V DC

Min. switching voltage / Min. switching current 24 V / 10 mA

Max. switching voltage / Max. switching current see "Load limits curves" on page 14

Rated operational current Ie

(IEC/EN 60947-5-1)

AC12 (resistive) at 230 V 4 A

AC15 (inductive) at 230 V 3 A

DC12 (resistive) at 24 V 4 A

DC13 (inductive) at 24 V 2 A

AC rating

(UL 508)

Utilization category (Control Circuit Rating Code)

max. rated operational voltage

max. continuous thermal current at B 300

max. making/breaking apparent power at B 300

B 300, pilot duty

general purpose (250 V, 4 A, cos φ 0.75)

250 V AC

4 A

3600/360 VA

Mechanical lifetime 30 x 106 switching cycles

Electrical lifetime AC12, 230 V, 4 A 0.1 x 106 switching cycles

Max. fuse rating to achieve short-circuit protection n/c contact 6 A fast-acting

n/o contact 10 A fast-acting

Conventional thermal current Ith (IEC/EN 60947-1) 4 A

1) Closed-circuit principle: Output relay(s) de-energize(s) if measured value falls below the adjusted threshold value Ran


General data

MTBF on request

Duty time 100 %

Dimensions (W x H x D) product dimensions 22.5 x 85.6 x 103.7 mm (0.89 x 3.37 x 4.08 in)

packaging dimensions 97 x 109 x 30 mm (3.82 x 4.29 x 1.18 in)

Weight Screw connection

technology

Easy Connect Technology

(push-in)

net weight 0,141 kg (0,311 lb) 0,130 kg (0,287 lb)

gross weight 0,166 kg (0,366 lb) 0,155 kg (0,342 lb)

Mounting DIN rail (IEC/EN 60715),

snap-on mounting without any tool

Mounting position any

Minimum distance to other units not necessary

Material of housing UL 94 V-0

Degree of protection housing IP50

terminals IP20

Electrical connection

Screw connection technology

Easy Connect Technology (Push-in)

Wire size fine-strand with(out)

wire end ferrule

1 x 0.5-2.5 mm²

(1 x 20-14 AWG)

2 x 0.5-1.5 mm²

(2 x 20-16 AWG)

2 x 0.5-1.5 mm²

(2 x 20-16 AWG)

rigid 1 x 0.5-4 mm²

(1 x 20-12 AWG)

2 x 0.5-2.5 mm²

(2 x 20-14 AWG)

2 x 0.5-1.5 mm²

(2 x 20-16 AWG)

Stripping length 8 mm (0.32 in)

Tightening torque 0.6 - 0.8 Nm

(5.31 - 7.08 lb.in)

-

Environmental data

Ambient temperature ranges operation -25...+60 °C

storage -40...+85 °C

transport -40...+85 °C

Climatic category IEC/EN 60721-3-3 3K5 (no condensation, no ice formation)

Damp heat, cyclic IEC/EN 60068-2-30 6 x 24 h cycle, 55 °C, 95 % RH

Vibration, sinusoidal IEC/EN 60255-21-1 Class 2

Shock, half-sine IEC/EN 60255-21-2 Class 2


Isolation data

Rated impulse withstand voltage Uimp

(IEC/EN 60947-1, IEC/EN 60664-1)

supply circuit / measuring circuit 6 kV

supply circuit / output circuit 6 kV

measuring circuit / output circuit 6 kV

Pollution degree (IEC/EN 60664-1) 3

Overvoltage category (IEC/EN 60664-1) III

Rated insulation voltage Ui

(IEC/EN 60947-1, IEC/EN 60664-1)

supply circuit / measuring circuit 400 V

supply circuit / output circuit 300 V

measuring circuit / output circuit 400 V

Basic insulation for rated control supply

voltage (IEC/EN 60664-1)

supply circuit / measuring circuit 400 V AC / 300 V DC

supply circuit / output circuit 250 V AC / 300 V DC

measuring circuit / output circuit 400 V AC / 300 V DC

Protective separation

(IEC/EN 61140, EN 50178)

supply circuit / output circuit 250 V AC / 250 V DC

supply circuit / measuring circuit 250 V AC / 250 V DC

measuring circuit / output circuit 250 V AC / 250 V DC

Test voltage, routine test

(IEC/EN 60255-5, IEC/EN 61010-1)

supply circuit / output circuit 2.32 kV, 50 Hz, 2 s

supply circuit / measuring circuit 2.32 kV, 50 Hz, 2 s

measuring circuit / output circuit 2.2 kV, 50 Hz, 1 s

Standards

Product standard IEC/EN 61557-8, IEC/EN 60255-6

Other standards EN 50178

Low Voltage Directive 2006/95/EC

EMC Directive 2004/108/EC

RoHS Directive 2002/95/EC

Electromagnetic compatibility

Interference immunity to IEC/EN 61000-6-1, IEC/EN 61000-6-2, IEC/EN 61326-2-4

electrostatic discharge IEC/EN 61000-4-2 Level 3, 6 kV / 8 kV

radiated, radio-frequency, electromagnetic field IEC/EN 61000-4-3 Level 3, 10 V/m (1 GHz) / 3 V/m (2 GHz) / 1 V/m (2.7 GHz)

electrical fast transient/burst IEC/EN 61000-4-4 Level 3, 2 kV / 5 kHz

surge IEC/EN 61000-4-5 Level 3, installation class 3, supply circuit and

measuring circuit 1 kV L-L, 2 kV L-earth

conducted disturbances, induced by radio-frequency

fields

IEC/EN 61000-4-6 Level 3, 10 V

voltage dips, short interruptions and voltage variations IEC/EN 61000-4-11 Class 3

harmonics and interharmonics IEC/EN 61000-4-13 Class 3

Interference emission IEC/EN 61000-6-3, IEC/EN 61000-6-4

high-frequency radiated IEC/CISPR 22, EN 55022 Class B

high-frequency conducted IEC/CISPR 22, EN 55022 Class B


Technical diagrams

Load limits curves

300

200

1008060504030

20

101 2 4 6 10

I A

V

V

0.1 0.2 0.5

2CD

C 2

52 1

94 F

0205

AC load (resistive)

cos ϕ

F

0.5

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

0.6

0.7

0.8

0.9

1.0

2CD

C 2

52 1

92 F

0205

Derating factor F at inductive AC load

300

200

1008060504030

20

101 2 4 6 10

I A

V

V

0.1 0.2 0.5

2CD

C 2

52 1

93 F

0205

DC load (resistive)

Switching current [A]

250 Vresistive load

Sw

itchi

ng c

ycle

s

2CD

C 2

52 1

48 F

0206

Contact lifetime


Dimensions

in mm and inches

113.4 4.47”

22.5 0.89”

85.6

3.37

”

103.7 4.08”

105.9 4.17”

2CD

C 2

52 0

09 F

0011

CM-IWS.2 - Insulation monitoring relay

Accessories

22.5 0.89”

68 2.68

”

110.5 4.31”

8 0.32”

4.8 0.19”

front to back

2CD

C 2

52 0

10 F

0011

6.5 62.5

60

1011

.5

20

0.25

6”

2.461”

2.362”

70 2.756”

0.39

4”

0.78

7”

0.45

3”

2CD

C 2

52 0

08 F

0010

203A11 8

0.31

5”

0.787” 2CD

C 2

52 1

86 F

0005

ADP.01 - Adapter for screw mounting MAR.01 - Marker label for devices

without DIP switches

COV.11 - Sealable transparent cover

Further documentation

Document title Document type Document number

Electronic products and relays Catalog 2CDC 110 004 C020x

CM-IWS.1, CM-IWS.2 Instruction sheet 1SVC 730 550 M0000

You can find the documentation on the internet at www.abb.com/lowvoltage -> Control Products -> Electronic Relays and Controls -> Insulation monitors.

ABB STOTZ-KONTAKT GmbHP. O. Box 10 16 8069006 Heidelberg, GermanyPhone: +49 (0) 6221 7 01-0Fax: +49 (0) 6221 7 01-13 25E-mail: [email protected]

You can find the address of your local sales organisation on the ABB home pagehttp://www.abb.com/contacts -> Low Voltage Products and Systems

Contact us

Note:We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB AG does not accept any responsibility whatsoever for potential errors or possible lack of information in this document.

We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its contents – in whole or in parts – is forbidden without prior written consent of ABB AG.

Copyright© 2012 ABB All rights reserved

Do

cum

ent

num

ber

2C

DC

112

196

D02

01 (0

8.20

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Insulation monitoring relay CM-IWS

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